Execute Timer Object with Threads in Service c#

I have to write a windows service. My requirement is as below.

I will get multiple frequency list dynamically for example 1 sec, 1 min, 5 min.

I have a method DoWork() in my windows service which will actually processes my core logic.

I don't need to wait for the response of the DoWork() method. So i have to run this using Thread.

DoWork() method should get executed for every 1 sec, 1 min and 5 min and each execution should be in an independent thread.

Can anyone provide an example for this? or any suggestion on how to do this.